Assigxob op oxe-half



(No Model.)

- L. MURRAY.

v MANUFACTURE OF CLOCK AND WATCH BALANCES;

Patented Mar 22, 1887.

W/T/VEEEEE. Q73

Unrnn STATES PATENT since.

TO THE HOW'ABD VATGH AND CLOCK COMPANY, OF SAME PLACE.

MANUFACTURE OF CLOCK AND WATCH BALANCES.

SPECIFICATION forming part of Letters Patent No. 359,980, dated March 22, 1887.

Application filed January- 4, 1887. Serial No. 223,342. (No model.)

To all whom it may concern:

Be it known that l, LEONIDAS ll'IURRAY, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in the Art of and Means for Manufactu ring CompensationBalances for WVatches and Clocks, of which the following is a specification.

My invention relates to the art of manufac- 1O turing compcnsatioirbalances for watches and clocks.

The method commonly employed in making watch and clock compensation-balances is to first drill the stcelblauk, then turn it to the i 5 required thickness and diameter, then melt or i use on the periphery of this steel blank a ring or lamina of brass, and, finally, after properly dressing or turning down the balanceblank so formed to roll or hammer the brass rim to obtain the requisite temper. The objection to this mode of procedure is that the step pursued for the purpose of tempering or hardening the brass rim has a tendency, also, to elongate it, and at the same time impair its weld or union with the steel blank or disk.

It is the object of my invention to overcome the obj ectiou mentioned, and this I do by the improved method which 1 will now proceed to describe and claim, reference being bad to the 33 accompanying drawings and the letters of reference marked thereon, forming apart of this specification, the same letters indicating the same parts wherever they occur.

In said drawings, Figure 1 represents a plan 35 view of a drilled steel blank; Fig. 2 is a vertical central section of the same and a capsule supporting and surrounding it preparatory to receiving the ring orlaminaof brass to be fused thereon. Fig. 3 represents a section similar to thatportrayedin Fig. 2, showing thebrass ring united to thesteel blanlgas also the capsule, by fusing. Fig. 4- represents the balance after the capsulehas been turned cit. Fig. 5 is a diagram showing the old method of hardening or temper- 5 ing the brass ring or periphery of the balance. Fig. 6 represents the means employed in my improved method of tempering or hardening the lamina or ring of brass forming the rim or periphery of the balance.

In forming compensation balances for watches or clocks it is common, first, to construct a properly-drilled steel blank, a, as represented in Fig. 1, which blank is supported on a capsule consisting of a plate, 0, having an oii'set, as atd, to receive the blank, for the 5 5 purpose of maintaining the latter in proper position, and a circular rim, 1), extending at substantially right angles to the plate 0 and at a distance uniform in extent from the periphcry of the blank a in position on the plate 0 to permit the brass ring 0 to be fused on the blank to be placed therearound within the circle formed by the rim (1. In this position the parts are placed in a furnace, and the brass ring 0 fused and united to the blank a, which process also unites said ring to the capsule c d, the latter device being used as a mere expedient for maintaining the parts in proper position during the operations of fusing, and composed of material which will not fuse at as low temperature as that required to melt the brass ring a. The capsule is now turned off, which leaves the balance in the condition represented in Fig. 4:

In order to harden or temper the brass rim 7 5 or lamina c on the blank (1, it has been usual to place it between a plurality of rollers, r r, as represented in Fig. 5. This operation, however, has a tendency to elongate the lamina, as also to impair its union with the steel blank a, both of which results prevent the construction of a perfect balance. To overcome this difficulty, I construct a steel die, f, forming therein a slightly-tapered hole, g, of a diame ter suflicient at its larger end to admit the balance after the capsule has been turned off therefrom, and by means of a plunger, h, force the balance through said hole from the larger to the smaller end, thus securing a perfectly even compression on the lamina or ring at all points, tempering or hardening the same precisely as desired and without elongating it or in the least degree impairing its union or weld with the steel blank.

It will be seen that my improved method is 5 even simpler than that heretofore practiced, while at the same time it entirely overcomes the obj ections heretofore met with in the tempering or hardening of rings or laminae on watch and clock balances.

Having thus described my invention, what I claim is- 5 The improvement in the art of tempering or J hardening a lamina or ring on a watch or clock 7 balance, which consists in placing the balance having the lamina or ring united thereto in the larger end of a slightly-taperedhole formed 10 in a die, and forcing said balance through to the smaller end, substantially as set forth.

In testimony whereof Ihave signed my name to this specification,in the presence of two subscribing witnesses, this 29th day of December,

' LEONIDAS MURRAY.

XVitnesscs:

ARTHUR W. GRossLnY, O. W. H. BROWN. 

